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Electrochemical device and electronic device comprising same

A technology of electrochemical and negative electrode active materials, applied in the field of energy storage, can solve the problems of low electrical conductivity, insufficient processing performance, high cycle expansion rate, etc.

Pending Publication Date: 2021-07-23
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, materials with higher energy density (e.g., silicon-based materials) often have problems that do not match existing cell structures, such as too low electrical conductivity, too high cyclic expansion, insufficient processability, etc.

Method used

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  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same
  • Electrochemical device and electronic device comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0075] In some embodiments, the preparation method of the negative electrode of the present application includes the following steps:

[0076] Take a certain amount of negative electrode active material, mix it with a binder and a conductive agent in a fixed weight ratio, add it into deionized water and stir evenly. After stirring, the mixed slurry is obtained by screening.

[0077] The mixed slurry is coated on a negative electrode current collector (eg, copper foil) using a gravure roll with specifically designed recessed areas or no recessed areas, and dried. After drying, a cold pressing treatment is performed to obtain a negative electrode active material layer.

[0078] It should be understood that, without departing from the spirit of the present application, each step in the preparation method of the negative electrode in the embodiment of the present application can be selected or replaced with other conventional processing methods in the field according to specific ...

specific Embodiment

[0102] Some specific examples and comparative examples are enumerated below, and its electrochemical device (lithium ion battery) is carried out cycle performance test, cycle thickness expansion rate test, lithium analysis test, degree of deformation test and circularity test after cycle respectively to better The technical scheme of the present application will be described in detail.

[0103] 1. Test method

[0104] Cycle performance test:

[0105] Place the lithium-ion batteries of the following examples and comparative examples in a constant temperature box at 25°C±2°C for 2 hours, charge them at a constant current of 0.5C to 4.4V, then charge them at a constant voltage of 4.4V to 0.02C and let them stand 15 minutes; then discharge to 3.0V with a constant current of 0.5C, this is a charge-discharge cycle process, record the discharge capacity of the lithium-ion battery for the first cycle; then repeat the charge-discharge cycle process according to the above method, and r...

Embodiment 1

[0125] A mixture of silicon-based materials and graphite is used as the negative electrode active material, wherein the particle size of the negative electrode active material is 10 μm, and the gram capacity of the negative electrode active material is 620mAh / g. The negative electrode active material, styrene-butadiene polymer, carboxymethyl Cellulose sodium and conductive carbon black are added to deionized water at a weight ratio of 94.4:1.6:1.0:3.0 to form negative electrode slurry. Copper foil was used as the negative electrode collector. Use a gravure roll with a certain shape of non-cavity areas, wherein the area of ​​each non-cavity area (corresponding to the area of ​​the second area after coating) is 20 μm 2 , coating the negative electrode slurry on the surface of the current collector, and the thickness of the coating is 10 μm. Subsequently, drying in an oven at 90° C. to 120° C. to obtain a negative electrode active material layer with through holes, wherein the c...

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Abstract

The invention relates to an electrochemical device and an electronic device comprising the same. The electrochemical device comprises a positive electrode, a separation membrane and a negative electrode, wherein the negative electrode comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material layer comprises a first negative electrode active material layer. When the electrochemical device is in a fully discharged state (0% SOC), the first negative electrode active material layer comprises a first region and at least one second region, the first region is integrally connected, and at least one part of the second region is surrounded by the first region. According to the electrochemical device, through the arrangement, the volume expansion and deformation of the negative electrode, especially the high-silicon-content negative electrode in circulation can be improved, so that good circulation performance and safety performance are obtained.

Description

technical field [0001] The present application relates to the technical field of energy storage, and in particular to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] With the rapid development of mobile electronic technology, the frequency and experience requirements of people using mobile electronic devices such as smartphones, tablets, laptops, drones and various wearable devices are getting higher and higher. Therefore, electrochemical devices (eg, lithium-ion batteries) that provide energy for electronic devices need to exhibit higher energy density, greater rate, and higher safety. [0003] The life and performance of lithium-ion batteries are closely related to the stability of their negative electrodes. In view of this, people continue to study negative electrode active materials with higher energy density. However, materials with higher energy density (eg, silicon-based materials) often have pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/70H01M4/36H01M10/0525
CPCH01M4/667H01M4/70H01M4/36H01M10/0525Y02E60/10
Inventor 李天君
Owner NINGDE AMPEREX TECH